单项选择题
A.0 is not valid in an IP address
B.128 is a reserved network
C.The subnet mask should be 255.255.0.0. since it is a class B
D.A network problem has occurred since IP and subnet are valid
单项选择题 WhichofthefollowingoptionsisrepresentativeofaClassBaddress？（）
单项选择题 The local host on a small network is named Earth. There is also a remote host on the network named Saturn. The system administrator of the network is in the /u/tmp directory of Earth， and starts an ftp to Saturn as root. Which of the following sequence of commands issued from the local host， Earth， will：（）。 1.Check to see if there is an a.out file on remote host Saturn. 2.Change to the /u/new directory on Earth. 3.Transfer a.out from Earth to Saturn.
单项选择题 WhichofthefollowingcommandswillnotstoreroutesintotheODM？（）